Combination micrometer



May 10, 1949. R, LAYTQN 2,469,926 COMBINATION MIGROMETER 2 sheets-sheet 1 Filed June 7, 1946 :fn nog IN VEN TOR.

ATI'EI RNEYB R. LAYTON COMBINATION MICRCMETER May 1o, 1949.

2 Sheets-Sheet 2 File June 7, 194e IN VEN TOR.

' A'rrDRNEYs Patented May 10, 1949 UNITED STATES FATENT OFFICE 2,469,926 SOMBINA'EON MICROMETER Ray Layton, Muskegon, Mich. Application June 7, 1946, Serial No. 674,999

3 Claims.

My present. invention, in its broad aspect, has reference to improvements in micrometers, whereby precisioned measurements may be made as to depth, Outside and inside dimensions Within a wide radius. More particularly, it is my purpose to provide an improved precision instrument, whereinairame carries an ordinary depth micrometer, and in one end of which is mounted in a collar for threaded screw adjustment. A post, which is sety in the end ci arverticallyslidable bar set horizontal and parallel to the frame, and carrying at the other endva contact point engaging in the Zero position another contact element on a bar also horizontal and parallel to the frame and which connected by an upwardly and then downwardly bent elbow to a vertical primary adjustment post which is at right angles to the frame and passes through a sleeve at the other end of the frame, and has precision openings one-inch apart upon which the frame is Xed by a set screw in the sleeve. Primarily, by means of this simple mechanical attachment to the ordinary depth micrometer, 1' am enabled by the structure herein shown to make precision inside, outside and depth measurements up to seven inches over-all for inside diameters, and six inches over-all for outside diameters and depths. My device is simple, sturdy and practical, and has no parts likely to get out of order or to become broken or deranged.

Other and equally important objects and advantages of my invention will be apparent from the following description and drawings, but it is pointed out that changes in form, size, shape, materials, construction and arrangement oi parts may be made and are within the purview of my broad inventive concept, and the scope of the appended claims.

In the drawings, wherein I have illustrated a preferred form oi my invention- Figure 1 is a side elevation of my device set at the zero point with both contacts lightly eneasing;

Figure 2 is a side elevation of my device set at a three-inch general adjustment of the frame, with four inches between contact points with 3.500 measurement all for inside diameters;

Figure 3 is a detail View of the lower horizontal bar;

Figure 4 is a section on the line 4-4 of Figure 1;

Figure 5 is a section on the line 5-5 of Figure 1, and

Figure 6 is a detail view of the upper horizontal bar connected by the elbow to thev ver'- tical post.

In the drawings, wherein like characters of reference are used to designate like or similar parts `throughout the several views- The numeral I designates a conventional depth micrometer which is the basisofthe precision: measurements as to inside and outside diameters and depth madel by myV present .precision instrument. The head' end of. the graduated sleeve 2 is setin a horizontal frame 3. which has a` small sleeve or hubl Il at one end anda large sleeve or hub 5 at the other. Slidable in the sleeve 5 is a post 5 having a keyway l, and a thumb-screw 8 set in a boss in the sleeve is designed to engage a key in the keyway and x not only the position of the post in the frame, but to prevent the frame from turning with respect to the post. The post is xed in the end of a long gage bar 9 having an opening I0 through which a -gage rod II which is at right angles to the frame passes. The bar 9 has a contact element I2 at its outer end which is designed to engage another contact element I3 on a short gage bar I4 which is connected by the upwardly and downwardly curved elbow to the gage rod II. The bar 9 is also provided with a pin 9a that is positioned to be engaged by the end of the plunger 2a of the micrometer. The elbow may be pinned, as yat I5, to the gage rod II. The gage rod II when contact elements I2 and I3 engage my device, is in zero position. The gage rod II has a plurality of conical depressions or seats I5 formed therein with centers exactly one-inch apart. The sleeve 4 has a set screw or thumb screw Il xing it in one of the seats I6 to adjust the frame 3 for broad adjustments. Illustration of the operation of my device will be evident by reference, particularly to Figures 1 and 2. In Figure 1, the contact elements I2 and I3 represent the zero of my device, the measurement is exactly one-inch (1.000). Figure 2 shows the set screw I'I set in the third concave depression I6. The frame 3 is raised so that the micrometer reads .500 inch. There is now a total between points of 2.500, while the measurement for inside diameter is 3.500. When using the device as a depth micrometer, the upper arm I4 is removed from frame 3 and the frame is slid off the post 6.

From the foregoing it is believed that the operation and advantages of my invention will be apparent, but it is again pointed out that interpretation of the scope of my invention should only be conclusive when made in the light of the subjoined claims.

I claim:

1. A combination micrometer having a graduated sleeve with a plunger extending therefrom comprising a frame mounted on the end of the graduated sleeve and perpendicular thereto, a post slidably mounted in the frame, means clamping the post in adjusted positions in the frame, a long gage bar xed at one end to one end of the post and having an opening therethrough, a contact member on the other end of said long gage bar, said long gage bar having a pin therein positioned to be engaged by the plunger extending from the micrometer, and a gage rod having spaced depressions therein slidably mounted in the frame and positioned in the opening of the large gage bar, means clamping said gage rod in the frame, and a short gage bar having a contact member on the outer end thereof aligned with the Contact member of the long gage bar and carried by one end of the said gage rod.

2. A combination ated sleeve With the micrometer having a graduplunger extending therefrom, comprising a frame With a small hub at one end and a large hub at the other mounted on the end of the graduated sleeve and perpendicular thereto, a post having a keyway therein slidably mounted in the large hub at one end of the frame, means clamping the post in adjusted positions in the hub through the key inthe keyway, and a long gage bar fixed at one end to one end of the post and having an opening therethrough, a contact member on the other end of said long gage bar, said long gage bar having a pin therein positioned to be engaged by the plunger extending from the micrometer, a gage rod having spaced depressions therein slidably mounted in the small hub of the frame and positioned in the opening of the large gage bar, means clamping said gage rod in the small hub, and a short gage bar having a Contact member on the outer end thereof aligned with the contact member of the large gage bar and carried by one end of the said gage rod.

3. A combination micrometer as described in claim 2, wherein the clamping means for securing the post and gage rod in the hubs of the frame comprise thumb screws with the thumb screw in the large hubiengaging the key in the keyway of the post.

RAY LAYTON.

REFERENCES CITED The following references are of record in the le of thisA patent:

UNITED STATES PATENTS 

